Lexus IS250 4GR-FSE Engine Carbon Build-up (merged threads)
#781
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I read a lot about this carbon buildup issues and Lexus replaced the piston and ring on my 09 IS250 about 3 months ago. After replaced, I don't have the issue of stall when I come to a stop. I know it's not a permanent fix, but does anyone know if the Lexus extended warranty cover this work if I need to replace the piston/ring again in the future ?
#782
Honestly, I don't think there is ever going to be an actual fix. Carbon build up will happen in a DI engine without any way to clean the valves. Slowing it down is helpful, and doing an engine clean every now and then isn't the end of the world to me. I wish there was a better answer, but I don't think there is going to be.
Jeff
Jeff
#785
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Honestly, I don't think there is ever going to be an actual fix. Carbon build up will happen in a DI engine without any way to clean the valves. Slowing it down is helpful, and doing an engine clean every now and then isn't the end of the world to me. I wish there was a better answer, but I don't think there is going to be.
Jeff
Jeff
Interestingly, GM has had no reports of this issue in their DI Ecotecs and HF v6s.
#786
Make sure your morning rattle is just piston slap and not the cam gears. Theres not much you can do for the carbon issue, the valves do get cleaned w the bulletin and the pistons have been redesigned w shorter skirts to adress the oil consumption issue
#787
I've been reading a lot on the subject lately, and it seems many makers, including Audi and BMW have had carbon buildup issues with DI engines. The solution seems to lie in proper in engine redesign to improve the flow pattern, coating the valves with anti stick compounds, and reconfiguring the EGR system to not allow carbon particles to blow back. In short, a whole engine redesign is needed. With all DI and Turbo DI engines being released, I expect a lot of people will learn more about this issue. I doubt your average Elantra or Focus owner will take well to a 1500$ top engine cleaning bill every 40k.
Interestingly, GM has had no reports of this issue in their DI Ecotecs and HF v6s.
Interestingly, GM has had no reports of this issue in their DI Ecotecs and HF v6s.
Still, slowing it down is still a step in the right direction.
Jeff
#788
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Gryss, I got the top end cleaning done about 10K ago.
After that, I feel the engine runs very tight, barely making any "noise" as well as the throttle tip-in to be on the slow side, meaning I have to push the gas pedal (feels more resistance) down to get it moving, as opposed to a light touch to spin it up. Ever heard of anything like this?
After that, I feel the engine runs very tight, barely making any "noise" as well as the throttle tip-in to be on the slow side, meaning I have to push the gas pedal (feels more resistance) down to get it moving, as opposed to a light touch to spin it up. Ever heard of anything like this?
Marbles in a blender type noise heard on cold start sounds like a issue with the cam actuators. Not related to carbon buildup issues. There is a TSB out for those actuators. get it looked at.
#789
Gryss, I got the top end cleaning done about 10K ago.
After that, I feel the engine runs very tight, barely making any "noise" as well as the throttle tip-in to be on the slow side, meaning I have to push the gas pedal (feels more resistance) down to get it moving, as opposed to a light touch to spin it up. Ever heard of anything like this?
After that, I feel the engine runs very tight, barely making any "noise" as well as the throttle tip-in to be on the slow side, meaning I have to push the gas pedal (feels more resistance) down to get it moving, as opposed to a light touch to spin it up. Ever heard of anything like this?
Here is what happened:
Before I got the carbon cleanup job done, I was using regular 87 gas.
But after the cleanup I decided to be the good boy and started using Full premium gas.
Yesterday, looking at the high prices at the gas station, I was tempted to use the regular 87, and I did just that. As a result, this morning I have the engine is revving just as lightly as it did before.
Wow....
#790
By Golly. I have figured it out.
Here is what happened:
Before I got the carbon cleanup job done, I was using regular 87 gas.
But after the cleanup I decided to be the good boy and started using Full premium gas.
Yesterday, looking at the high prices at the gas station, I was tempted to use the regular 87, and I did just that. As a result, this morning I have the engine is revving just as lightly as it did before.
Wow....
Here is what happened:
Before I got the carbon cleanup job done, I was using regular 87 gas.
But after the cleanup I decided to be the good boy and started using Full premium gas.
Yesterday, looking at the high prices at the gas station, I was tempted to use the regular 87, and I did just that. As a result, this morning I have the engine is revving just as lightly as it did before.
Wow....
back to Full premium next time.
#791
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Chevron 91 for life.
#792
You gotta be kidding me... how many folks here with carbon build up have been running lower than spec octane? Ever? And blaming Lexus no doubt. If that's the reason for engine problems you deserve whatever you got.
#793
So you are saying that 87 octane causes carbon build up? really?
#794
So you're saying you're incapable of interpreting such a short post without putting your own spin on it? Really?
I asked a question, I didn't state anything that was not dependent on the answer to a question. Learn the language before you try.
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Update: Looking back at my post, I realize that I assumed you were trying to challenge me on a statement that I had not yet made and were being a dink about it. I'm now wondering if you were legitimately asking me if its possible that 87 octane could contribute to carbon build up. If that was how you intended the question, then I apologize for such a snarky response, but if my initial hunch was right then it still stands
I asked a question, I didn't state anything that was not dependent on the answer to a question. Learn the language before you try.
----
Update: Looking back at my post, I realize that I assumed you were trying to challenge me on a statement that I had not yet made and were being a dink about it. I'm now wondering if you were legitimately asking me if its possible that 87 octane could contribute to carbon build up. If that was how you intended the question, then I apologize for such a snarky response, but if my initial hunch was right then it still stands
Last edited by MBTC; 03-17-12 at 04:44 PM. Reason: Clarity